agonic line

agonic line

n.

An imaginary line on the earth's surface connecting points where the magnetic declination is zero.

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agonic line  (-gnk)

An imaginary line on the Earth's surface connecting points where the magnetic declination is zero. The agonic line is a line of longitude on which a compass will show true north, since where magnetic declination is zero, magnetic north coincides with geographic north.

Thesaurus

Noun

1.

agonic line - an imaginary line connecting points on the Earth's surface where the magnetic declination is zero line - a spatial location defined by a real or imaginary unidimensional extent

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A line drawn on a map or chart joining points of zero magnetic declination for a specified year date. See also magnetic declination.